This project was made in 2021 during the post-COVID period, for a startup named Greener Grow, to test indoor air quality improvement in the presence of indoor plants which improves air quality.
The project was made using an Arduino UNO, MQ-135 gas sensor and ESP-8266 WiFi module for Arduino.
For data visibility, the Arduino was connected to a ThingSpeak account, using a WiFi network, and the sensor readings were sent to ThingSpeak.